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Double grating three dimensional spectrograph

  • US 20030048442A1
  • Filed: 09/07/2001
  • Published: 03/13/2003
  • Est. Priority Date: 09/07/2001
  • Status: Active Grant
First Claim
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1. A device for separating light into its components providing a light output in a selected spectral band from a sample light input into the device for separating light into its components, comprising:

  • (a) an input light source;

    (b) a first concave spectrographic diffraction grating positioned to receive light from said input light source and configured to provide a diffracted light output dispersing the components of said input light source in a first direction, said dispersion forming said input light into an intermediate spectra, said intermediate spectra being formed in a focal surface by said once diffracted light;

    (c) a slit substantially positioned on said focal surface or approximately on said focal surface, said slit having a first edge whose position corresponds to the shortest wavelength for light to be passed by said slit and having a second edge whose position corresponds to the longest wavelength for light to be passed by said slit; and

    (d) a second concave diffraction grating positioned to receive once diffracted light from said slit and configured to provide a twice diffracted light output, said second concave diffraction grating dispersing the components of said input light source in a second direction, said second direction being different from said first direction, said dispersion forming said input light into an output spectra, said output spectra being formed on a focal surface by said twice diffracted light.

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